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| #include <stdio.h>
#include <iostream>
#include <string>
#include <string.h>
#include <vector>
#include<math.h>
#include <vector>
using namespace std;
#include<stdlib.h>
#include<gl/glut.h>
#define PI 3.14159265358979323846
/*--------------------------------/
|Name : Render
|Aim : Draw Polygons using vertex arrays ...
|
| IMPORTANT-IMPORTANT-IMPORTANT
|
/--------------------------------*/
//GLfloat vertex[]={ 1,1,0 , 0,0,0 , -1,-1,0 , 1,-1,0};
// GLdouble cyl[100][3];
struct vertex
{
double x,y,z;
};
vector< GLuint> d;
vector<vertex> vertexe;
vertex v1;
void drawCylinder(double r,double height)
{
int nbvertex=0;
double x=0,y=0;
double pre=height/20;
// glPointSize(1);
// glBegin(GL_POINTS);
int c=0;
for(double z=0;z<=height;z+=pre)
{
for(double t=0;t<=PI;t+=PI/20)
{
x=r*cos(t);
y=r*sin(t);
v1.x=x;
v1.y=y;
v1.z=z;
vertexe.resize(vertexe.size()+1);
vertexe[vertexe.size()-1]=v1;
d.resize(d.size()+1);
d[d.size()-1]=nbvertex;
nbvertex++;
}
}
}
void Render()
{
glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
glLoadIdentity();
glTranslatef(0,0,-6);
glEnableClientState (GL_VERTEX_ARRAY);
glVertexPointer(3 ,GL_DOUBLE,0,&/*vertex[0]*/vertexe[1]);
drawCylinder(5,10);
glDrawElements(GL_POINTS, 4, GL_UNSIGNED_INT, &d[1]);
glutSwapBuffers();
}
void changeSize(int w, int h) {
if(h == 0)
h = 1;
float ratio = 1.0* w / h;
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glViewport(0, 0, w, h);
gluPerspective(45,ratio,1,1000);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}
void processNormalKeys(unsigned char key, int x, int y) {
if (key == 27)
_exit(0);
}
void main(int argc, char **argv) {
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_DEPTH | GLUT_DOUBLE | GLUT_RGBA);
glutInitWindowPosition(100,100);
glutInitWindowSize(400,400);
glutCreateWindow("Vertex Arrays");
glutDisplayFunc(Render);
// glutIdleFunc(Render);
glutReshapeFunc(changeSize);
glutKeyboardFunc(processNormalKeys);
glutMainLoop();
} |
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